40 S&W Incendiary Tracer-The Munitions LabThis is a 6 round pack of The Munitions Lab . 40 S&W Incendiary Tracer. ITR Performance: All The Munitions Lab ITR rounds are built to militarystyle specifications and are rated for hard targets such as steel, hardwood, concrete, and glass. They may function on softer targets, but this is not guaranteed and should not be relied on. ITR ammunition has a performance sweet spot for the loudest bang and the biggest cloud: pistol rounds are optimized for